Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Logitech - G915 X TKL | Logitech - MX Keys S |
|---|---|---|
| Size | TKL | Full |
Between the G915 X TKL and MX Keys S, the G915 X TKL comes out ahead in several specs, while the MX Keys S wins on size. Overall, the G915 X TKL scores 38.3 and the MX Keys S scores 38.3 on our Mars Score.
Which should you buy?
These two are evenly matched on the broad strokes; the decision sits on which individual spec advantages weigh more for your use.
The G915 X TKL does not pull ahead on any single popular-comparison spec — its strengths sit in the spec-table groups rather than the headline advantages.
Pick the MX Keys S if you care most about size. Its strongest claims are size. The single most decisive one: Size: Full (vs TKL).
Both ship with comparable hot-swappable, wireless, polling rate, so those specs do not separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: Logitech - G915 X TKL or Logitech - MX Keys S?
The two products are effectively tied on the current Mars Score.The more useful decision is the trade-off behind that result: compare size against the way you will actually use the product.
Choose Logitech - G915 X TKL if…
Logitech - G915 X TKL does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
Choose Logitech - MX Keys S if…
Logitech - MX Keys S has the measurable edge on size.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Logitech - G915 X TKL wins
- No decisive advantages.
Why Logitech - MX Keys S wins
- ▲Size: Full (vs TKL).
Spec comparison
Switches
| Spec | Logitech - G915 X TKL | Logitech - MX Keys S |
|---|---|---|
| Switch type | GL Mechanical | Scissor |
| Hot-swappable | false | false |
Layout & Build
| Spec | Logitech - G915 X TKL | Logitech - MX Keys S |
|---|---|---|
| Size | TKL | Fulllead |
| RGB | truelead | false |
| Rotary knob | false | false |
| Case material | Aluminum | Plastic |
Connectivity
| Spec | Logitech - G915 X TKL | Logitech - MX Keys S |
|---|---|---|
| Wireless | true | true |
| 2.4 GHz | truelead | false |
| Battery | 40 h | 240 hlead |
| Polling rate | 1000 Hz | 1000 Hz |